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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0baaa189a57f4fe9221a0aa65c76fb0e368ebfc5945bc0569251c6bb821c355' 
  AND token = '2fjWJa0K6hz8PgtLxXAHf/cRoAE+vZw/Q+jDbIJaADA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}